<wicket:panel xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">

    <div wicket:id="radioGroup">
        <ul>
          <li wicket:id="radioButtons">
            <input type="radio" wicket:id="radio"/>
            <span wicket:id="label">[this is where Radio label will go]</span>
          </li>
        </ul>
    </div>

</wicket:panel>